2HZM | pdb_00002hzm

Deposited: 2006-08-09 Released: 2006-09-12
Deposition Author(s): Lariviere, L., Geiger, S., Hoeppner, S., Rother, S., Straesser, K., Cramer, P.

Experimental Data Snapshot

wwPDB Validation 3D Report Full Report

This is version 1.4 of the entry. See complete history.

(2006) Nat Struct Mol Biol 13: 895-901

PubMed Abstract:
The Mediator head module stimulates basal RNA polymerase II (Pol II) transcription and enables transcriptional regulation. Here we show that the head subunits Med8, Med18 and Med20 form a subcomplex (Med8/18/20) with two submodules. The highly conserved N-terminal domain of Med8 forms one submodule that binds the TATA box-binding protein (TBP) in vitro and is essential in vivo. The second submodule consists of the C-terminal region of Med8 (Med8C), Med18 and Med20. X-ray analysis of this submodule reveals that Med18 and Med20 form related beta-barrel folds. A conserved putative protein-interaction face on the Med8C/18/20 submodule includes sites altered by srb mutations, which counteract defects resulting from Pol II truncation. Our results and published data support a positive role of the Med8/18/20 subcomplex in initiation-complex formation and suggest that the Mediator head contains a multipartite TBP-binding site that can be modulated by transcriptional activators.

Organizational Affiliation

Gene Center Munich, Department of Chemistry and Biochemistry, Ludwig-Maximilians-Universität München, Feodor-Lynen-Str. 25, 81377 Munich, Germany.

Macromolecule Content

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| 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
RNA polymerase II mediator complex subunit 20	A, C, E, G	212	Saccharomyces cerevisiae	Mutation(s): 0 Gene Names: SRB2, HRS2, MED20
UniProt
Find proteins for P34162 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c)) Explore P34162 Go to UniProtKB: P34162
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	P34162
Sequence Annotations Expand
Reference Sequence

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| 3D Structure

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
RNA polymerase II mediator complex subunit 18	B, D, F, H	317	Saccharomyces cerevisiae	Mutation(s): 1 Gene Names: SRB5, MED18
UniProt
Find proteins for P32585 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c)) Explore P32585 Go to UniProtKB: P32585
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	P32585
Sequence Annotations Expand
Reference Sequence

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
PO4 Query on PO4 Download:Ideal Coordinates CCD File SDF format, chain I [auth A] MOL2 format, chain I [auth A] mmCIF format, chain I [auth A]	I [auth A]	PHOSPHATE ION O₄ P NBIIXXVUZAFLBC-UHFFFAOYSA-K		Interactions Focus chain I [auth A] Interactions & Density Focus chain I [auth A]